[Octave-bug-tracker] [bug #55426] rsdec crashes when fcr>k and block contains errors

[anonymous]

URL:
  <https://savannah.gnu.org/bugs/?55426>

                 Summary: rsdec crashes when fcr>k and block contains errors
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Wed 09 Jan 2019 09:50:26 AM UTC
                Category: Octave Forge Package
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Segfault, Bus Error, etc.
                  Status: None
             Assigned to: None
         Originator Name: Tomer Ben Chen
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.4.1
        Operating System: Any

    _______________________________________________________

Details:

The following code crashes on both Linux and Windows when hitting any fcr >
249:

k=249;
for fcr=1:255
  % get generator polynom
  g=rsgenpoly(255,k,285,fcr);
  % reed-solomon encode
  e=rsenc(gf([zeros(1,k-1) 1],8,285), 255, k, g); 
  % single error
  e(1)=e(1)+1;
  % attempt to decode
  d=rsdec(e,255,k,g);  
  fprintf("success with fcr=%d\n",fcr);
end


Checked also with k=251, it again crashes on fcr>251.
Also checked when not inserting error (commenting the line "e(1)=e(1)+1"),
then it doesn't crash for any fcr in the range (1:255).








    _______________________________________________________

File Attachments:


-------------------------------------------------------
Date: Wed 09 Jan 2019 09:50:26 AM UTC  Name: test_rsdec.m  Size: 285B   By:
None

<http://savannah.gnu.org/bugs/download.php?file_id=45911>

    _______________________________________________________

Reply to this item at:

  <https://savannah.gnu.org/bugs/?55426>

_______________________________________________
  Message sent via Savannah
  https://savannah.gnu.org/